From 1995 to 1996, he was the Head of the Center of Administrative Management Group's strategic nuclear forces of the Ministry of Defense of Ukraine.

From 2003 to 2005, he was Head of the Department of Defence and Industry Policy Secretariat of the Cabinet of Ministers of Ukraine.

He was accused of illegally deciding on Sale of Assets Feodosia ship & mechanical plant.

Ivashchenko's lawyers filed a complaint with the European Court of Human Rights in relation to a violation of pre-trial and during the trial.

[3] A European Parliament mission led by former Polish President Aleksander Kwaśniewski investigated several trials and criminal judgments in Ukraine in the summer of 2012 (including those against Iwaschtschenko and against Julija Tymoshenko and Yuriy Lutsenko) and criticized the Ukrainian judiciary in the process.

Ivashchenko fled to Denmark, and in January 2013, the Danish government granted him and his wife political asylum.